I'll bet on small drones for small units and large swarms for brigade level. This takes care of most foot foldiers and vehicles.
Army Aviation would be reduced to supporting on tougher targets like bunkers or larger armor groups, artillery, SAMs, and ballistic platforms. Most of these is also part of the Air Force's mission. It's likely Army Aviation becomes more focused on unit logistics and transport than combat.
I'd say that the last time Army Aviation really got a bigger budget was Vietnam.
I doubt that. If you look at the budget history, since Reagan the lowest annual budget point is still more than half of the war years.
It's only true that war expenditure was 2x more in revenue than in peace time.
Total $139 billion from 1965 to 1974 (withdrawal started in 69, and virtually ended in 71); adjusted for inflation 6.7x => $931.3 billion.
Annual budget these days is roughly 50% higher than the whole war.
$16 billion in military aid, $7 billion in economic aid, adjusted for inflation 6.7x => $154.1 billion (more than half of Ukraine's first year)
Congress cut support in 71 so $154.1/6 = $25.68_3_ B/year
So actual American military got $111 billion/9 year => $12.3 B adjusted for inflation 6.7x => $82.6_3_ B/year
Accounting for drawdown on manpower and operational systems. It looks to me like the budget per military unit would almost double after the war.
I bet a lot more went into deleopment of the Nimitz, Los Angeles, Ohio, M1 Abrams, M2 Bradley, F14, F15, F16, F18, A10, AH64 and all that jazz than actual warfare expenditure.